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MC34923DW データシート(PDF) 10 Page - Freescale Semiconductor, Inc |
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MC34923DW データシート(HTML) 10 Page - Freescale Semiconductor, Inc |
10 / 16 page 34923 MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA 10 FUNCTIONAL DESCRIPTION Serial Interface The 34923 is controlled via a 3-wire (clock, data, strobe) serial port. The programmable functions allow maximum flexibility in configuring the PWM to the motor drive requirements. The serial data is clocked in starting with bit D19. D0–D1, Blank Time The current-sense comparator is blanked when any output driver is switched on in accordance with the table below. fosc is the oscillator input frequency. D2–D6, Fixed Off-Time A five-bit word sets the fixed off-time for internal PWM current control. The off time is defined as follows: toff = (8[1 + N] /fosc) - 1/fosc where N = 0 to 31. For example, with an oscillator frequency of 4.0 MHz, the off- time is adjusted from 1.75 µs to 63.75 µs in increments of 2.0 µs. D7–D10, Fast Decay Time A four-bit word sets the fast decay portion of the fixed off-time for the internal PWM control circuitry. This will only have impact if the mixed current decay mode is selected (via bit D17 and the PWMMODE input pin). For tfd > toff, the device will effectively operate in the fast decay mode. The fast decay portion is defined as follows: tfd = (8[1 + N]/fosc) - 1/fosc where N = 0 to 15. For example, with an oscillator frequency of 4.0 MHz, the fast decay time is adjusted from 1.75 µs to 31.75 µs in increments of 2.0 µs. D11–D12, Synchronous Rectification Control The active mode prevents reversal of load current by turning off synchronous rectification when a zero current level is detected. The passive mode will allow reversal of current but will turn off the synchronous rectifier circuit if the load current inversion ramps up to the current limit set by VREF/RS. D13, External PWM Decay Mode Bit D13 determines the current decay mode when using PWM/ENABLE chopping for external PWM current control. Bit Function D0 Blank Time LSB D1 Blank Time MSB D2 Fixed Off-Time LSB D3 Fixed Off-Time Bit 1 D4 Fixed Off-Time Bit 2 D5 Fixed Off-Time Bit 3 D6 Fixed Off-Time MSB D7 Fast Decay Time LSB D8 Fast Decay Time Bit 1 D9 Fast Decay Time Bit 2 D10 Fast Decay Time MSB D11 Synchronous Rectification Mode D12 Synchronous Rectification Enable D13 External PWM Decay Mode D14 Enable Logic D15 Direction Logic D16 Divisor SPAN Select D17 Internal PWM Mode D18 Test Mode D19 Sleep Mode D0 D1 Blank Time 0 0 4/fosc 1 0 6/fosc 0 1 12/fosc 1 1 24/fosc D11 D12 Synchronous Rect. Control 0 0 Disabled 0 1 Active 1 0 Disabled 1 1 Passive D13 Current Decay Mode 0 Fast 1 Slow Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
同様の部品番号 - MC34923DW |
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同様の説明 - MC34923DW |
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